English
ectodermal
From ecto- + dermal.
Proto-Indo-European *h₁én ‘in’
…
Proto-Hellenic *entós
Ancient Greek ἐντός ‘within, inside’
Ancient Greek ἐκ ‘out’
Ancient Greek ἐκτός ‘outside’
English ecto-
Today it means
adj Of or pertaining to the ectoderm.
Language periods are conventional ranges, not dates for this word.
Etymograph / ectodermal